Southampton have received a huge boost in their efforts to sign a player Russell Martin desperately wants with a deal now agreed. Russell Martin is focussed on preparing his Southampton squad for the Premier League this summer with work being done behind the scenes to give him the best possible chance of top flight survival. So far, that has seen six players sign ahead of the new season, with defence the priority early in the window. The latest of these is Yuginari Sugawara, with the Japanese right-back’s £5.88 million move confirmed on Sunday. READ MORE: New Southampton signing Yukinari Sugaw…